branch-4.0: [fix](load_stream) Fix use-after-free in TabletStream async lambdas #60148#60177
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…60148) The async lambdas in TabletStream captured raw 'this' pointer, which could become dangling when the TabletStream object is destroyed before the async task completes (e.g., when thrift connection is broken). Fix by using shared_from_this() to capture shared_ptr instead of raw pointer, ensuring the object stays alive until all async tasks complete.
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…nc lambdas apache#60148 (apache#60177) Cherry-picked from apache#60148 Co-authored-by: Xin Liao <liaoxin@selectdb.com>
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Cherry-picked from #60148